docs: def _tables_line(args):
    """Implements the BigQuery tables magic used to display tables in a dataset.
  
     The supported syntax is:
  
         %bigquery tables -p|--project <project_id>  -d|--dataset <dataset_id>
  
    Args:
      args: the arguments following '%bigquery tables'.
    Returns:
      The HTML rendering for the list of tables.
    """
    filter_ = args['filter'] if args['filter'] else '*'
    if args['dataset']:
      if args['project'] is None:
        datasets = [datalab.bigquery.Dataset(args['dataset'])]
      else:
        datasets = [datalab.bigquery.Dataset((args['project'], args['dataset']))]
    else:
      datasets = datalab.bigquery.Datasets(args['project'])
  
    tables = []
    for dataset in datasets:
      tables.extend([str(table) for table in dataset if fnmatch.fnmatch(str(table), filter_)])
  
    return _render_list(tables)